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Патент USA US3082597

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March 26, 1963
T. BRIMBERG
3,082,587
AIR FILTER
Filed Feb. 1s. 1960
¥
2 sheets-snaai 1
<
INVENToR.
March 26, 1963
T. BRIMBERG
3,082,587
AIR FILTER
Filed Feb. 18. 1960
2 Sheets-Sheet 2
INVENTOR.
Á’ÉÄTTOPIVE/
en “il nt
@ffice
3,3258?
Patented Mar. 26, l 963
2
3,932,587
AER :FILTER
Torsten Brimberg, Eandhagen, Sweden, assigner to
Alrtiebolaget Electrolux, Stockholm, Sweden, a corpo
ration of Sweden
l'áîiied Feb. 13, 1965i, Ser. No. 9,579
Claims priority, application Sweden Feb. 24, 1959
9 Qiaiins. (Cl. 55u-@Sl
My invention relates to air filters, and more particularly
to so-called “fine filters” for removing fine dust particles
and other foreign matter from air circulated through
household appliances.
lt is an object of my invention to provide an improved
air filter of this type having an air permeable sheet 1united
and bonded to a one-piece plastic body member which is
is apertured and in the form of a disk, is positioned be
tween the inner surfaces 12a of opposing ribs l2, as best
shown in FlG. 3. Essentially, the ribs l2 are split in a
lengthwise direction with their inner surfaces 12a back
to back. The hub 11 is formed with a groove lla within
which the inner periphery of the sheet 17 is held, and
the rim section 16a is formed with a groove 16e within
which the outer periphery of the sheet is held. It will be
understood that several porous sheets 17 may be held
together between the hub lll and rim section léa, the
sheets in such case being disposed between opposing ribs
i2 in the' manner shown in FIG. 3.
Since the outer flat section lob is fiexible, the filter 10
can be employed as a so-called “fine ñlter” in suction
cleaners having casings of different size. As illustrated
in PEG. 4, the filter iltl can be positioned within a casing
i3 in such a manner that the flange lob is bent at an
angle of about 90° to a plane passing through to filter
Further objects and advantages of my invention will
ld, so that the filter will be held in air-tight relation
become apparent as the following description proceeds,
and the features of novelty which characterize the inven 20 with the casing at a region which is adjacent to the out
let of the suction cleaner through which air is discharged.
tion will be pointed out with particularity in the claims
The apertured hub il is adapted to receive suitable fast
annexed to and forming a part of this specification.
ening member which passes therethrough and is ñxed to
For a better understanding of the invention, reference
a suitable part of the suction cleaner normally positioned
may be had to the following description taken in connec
tion with the accompanying drawings, in which:
25 within the casing 1S.
FIG. 5 illustrates another embodiment of the invention
FIG. l is a side view of an air filter embodying my
which is generally like that shown in FIGS. 1 to 4 and
invention;
differs therefrom in that two sheets 17a and l7b of porous
FIGS. 2 and 3 are enlarged fragmentary sectional views
material in abutting relation are held in place between
taken at lines 2_2 and 3_3, respectively, of FIG. l;
FIG. 4 is an enlarged sectional View of the air filter 30 the inner surfaces of opposing ribs 12b in the manner
shown in FlG, 3. The sheets 17a and l’ïb are apertured
shown in FIG. l positioned within a household appliance;
and of dished form, their inner and outer perpheríes 17h',
FIG. 5 is a sectional view of an air filter which is
i7@ and l’ïd, i7 e being fixed at lllb and 16d to the sloping
similar to FlG. 2 and ilustrates a modification of the
wall surfaces at the outer periphery of the hub llc and
invention;
‘
inner periphery of the inner >rim section loe, respectively.
FIG. 6 is a plan view of an air filter like that shown
As in the first described embodiment, the rim in FIG. 5
in FlG. l bent at its periphery to conform with the in
includes an outer fiat flexible rim section idf which can
terior of a household appliance of non-circular form;
assume the shape of the filter itilt in FIG. 4. In FIG. 5
FIG. 7 is an enlarged fragmentary side view of an air
it will be seen that the top sloping wall surface 16d at the
filter like that shown in FlG. l illustrating another em
bodiment of the invention; and
40 rim lee defines a wall which slopes outward from one
side of a horizontal plane passing through the layers 17a
FIG. 8 is a fragment-ary perspective view of the air
and l’l'b of air-permeablel material, the wall '16d sloping
filter shown in FIG. 7 to illustrate details.
at an acute angle to the plane and in a direction toward
Air filters in accord with the invention are particularly
the outer periphery of the rim 15e; and that the top
useful in suction cleaners of the household type which
sloping wall surface 1lb at the hub or part llc removed
usually include a motor-fan unit located within a casing
from the rim loe defines a wal1 which slopes outward
at a region adjacent to a dust bag, such until including
from the same side of the horizontal plane passing
a centrifugal fan carried at one end of an electric motor.
through the layers 17a and 17b, the wall 1lb sloping at
When the suction cleaner is being operated to clean a sur
an acute angle to the plane and in a direction from the
face, dust-laden air is drawn through a suction hose into
rim 3.6. The top layer 17a of air-permeable material is
the interior of the casing by the motor-fan unit. During
provided with outer and inner peripheral edge portions
cleaning, dust collects in the dust bag, and air free of such
17a’ and 1712', respectively, which overlie the sloping
dust passes through the dust bag and is discharged from
walls lod and lib and are fixed thereto.
the casing by the motor-fan unit. A very fine ñlter often
FIG. 6 illustrates the shape the filter lti‘ of FIGS. l to
is provided in the casing at the outlet end thereof through
4 will assume when it is positioned in a casing which is
which air passes in order to remove fine dust particles
octagonal in cross-section. In this instance, the outer
and other foreign matter therefrom which tend to pass
dat rirn section lób will be bent in the manner shown in
through a conventional dust bag which may be formed
FIG. 4 and assume the shape of the eight-sided casing
of cloth, for example, that is permeable to air.
within which it is held.
Referring to FEGS. l to 4, l have provided an improved
ln order to facilitate positioning a filter embodying the
air filter l@ which may be conveniently employed as a 60
invention within a casing, the outer flat rim section 1612
fine filter in suction cleaners having casings of different
of FIGS. l to 4 may be formed with radial slits 16g, as
size. The air filter l@ comprises an apertured hub or
illustrated in FlG. 7. When the filter of FIG. 7 is posi
tubular section il and rib structure comprising a number
tioned within `a casing, portions of the outer rim section
of spaced ribs l2 which are' distributed about the hub 1l
leb will overlap, as shown in FIG. 8, to provide a snug
and extend radially therefrom at 14. The outer ends of
and air-tight fit of the filter within the casing.
the ribs 12 are fixed at l5 to the inner periphery of a rim
The apertured hub, ribs and rim of the filters illus
16 having an inner section léa whose thickness is about
trated and described above may be formed in one piece,
-the same as that of the hub l1 and an outer flat flexible
the different parts of which are integrally joined to one
section lob.
another. When the filters are formed in this manner
The filter 10 is provided with sheeting 17 of porous
from a suitable thermoplastic, such as polyethylene, for
material which is permeable to :air and preferably micro
example, the sheet i7 of air permeable material may be
porous in character. The sheet or membrane 17, which
simple and inexpensive to manufacture.
3,082,587
3
4
positioned between cooperating parts of a two-part die
rim at its periphery which is ñxed thereto, the inner sur
face of said rim having a pair of walls which are adjacent
to one another at their inner edges and slope outward
or mold provided with suitable cavities and passages
adapted to receive polyethylene in a iluid or relatively
sottY state- by injection or similar manner. Similarly,
Veach of the sheets 17a and 17h of dished form in the
embodiment of FIG. 5 may be positioned in one of two
cooperating die parts provided with suitable cavitiesy and
passages adapted to receive polyethylene which is in
a liuid or relatively soft state atan elevated temperature.
Filters of the ltype illustrated and described above may
be readily formed in this manner and possess the ad
vantage' that, when the polyethylene has cooled and
solidified, it will have become united and bonded to the
porous sheets at the' hub and rim and at the inner sur
faces of the rib sections. The air permeable porous
sheet 17 in the embodiment of FIGS. 1 to 4 and the
porous sheets 17a and 17b in the modification of FIG. 5
Idesirably are formed from a mixture of fibrous »thermo
plastic material and other fibrous material, such as mineral
-fibers or textile fibers or both, the mixture preferably
being felted and in the form of a membrane. When the
polyethylene is at ran elevated temperature and in a
ñuid or relatively soft state, as explained above, the
from their inner edges in a direction toward the outer pe
riphery of the rim and form an angle therebetween which
is greater than 90° and less than 180°, said rib structure
including ribs split in a lengthwise direction to provide
rib sections with their inner surfaces back to back, and
sheeting of air-permeable material held between said rib
sections, said sheeting having a pair of outer peripheral
edge portions, each of said outer peripheral edge portions
overlying a different one of said outwardly sloping walls
and being tixed thereto.
j
2. An article as set forth in claim l in which said rib
structure includes a part removed from said rim to which
a plurality of said ribs are ñxed, the outer peripheral sur
face of said part having a pair of walls which are adja
cent to one another at their inner edges and slope out
ward from their inner edges in a direction from the rim
20 and form an angle therebetween which is greater than
90° and less than 180°, said sheeting of air-permeable ma
terial having- a pair of inner peripheral edge portions,
each of said inner peripheral edge portions overlying a
dilterent one of the last-mentioned outwardly sloping walls
vpolyethylene is brought into intimate physical contact
`
fwith the microporous air permeable sheets. When the 25 and being -iixed thereto.
3. An article as set forth in claim 1 in which said
polyethylene is heated to a suiiiciently high temperature
sheetingcomprises 'a plurality of layers of air-permeable
and is flowable, it impregnates the pores of the fibrous
material, said outer peripheral outer edge portions being
material forming the porous sheets and welds `and fuses
formed by the outermost portions of the outer layers of
the @sheets and hub, >ribs and vrim together to provide
air-permeable material.
`
a filter all the parts of which are integrally united and 30
4. An article as set forth in claim 2 in which said sheet
joined Vto one another. In the embodiment of FIG. 5,
ing comprises a plurality of layers of air-permeable ma
for example, the-portions of the sheets or membranes 17a
terial, the outer peripheral edge portions being formed by
and 17b held between opposing ribs 12b are united and
the outermost portions of the outer layers of air-permeable
joined to one another and to the ribs to form radially ex
the outer layers of air-permeable material hav
tending spokes which are relatively strong and yet flexible 35 material,
ing inner portions removed from the outermost portions,
in a lengthwise direction to allow bending and iiexing of
and each of the inner peripheral edge portions being
the filter when being inserted into and removed from a
formed by a different one of the inner portions of the
household appliance.
,
outer layers.
Y
'
An air filter like the one described above and illus
5. An article of the class described comprising a body
trated in FIGS. 1 to 4 has been constructed having two 40 of air-permeable material including rib structure and a
sheets 17 of microporous material in abutting relation,
rim at its periphery which is -ñxed thereto, said rib struc
the hub ll'having an opening which is about 1%2 inch
ture including ribs split in a lengthwise direction to pro
in diameter and an outer ñat rim section 1611 whose outer
vide rib sections with their inner surfaces back to back
diameter Vis about 5%6 inches. In this construction, each
and a part removed from said rim to which a plurality of
porous >sheet or membrane is about 1%;4 inch thick and
said ribs are fixed, the outer peripheral surface of said
united and welded to a body of polyethylene plastic in
part having a pair of walls which are adjacent to one an
which the overall thicknesses of the hub 11, ribs 12
other at their inner edges and slope outward from their
and inner rim section 16a are about 5/32 inch. The
inner edges in a direction from the rim and form an angle
maximum width of the hub 11 and inner rim section
therebetween which is greater than 90° and less than 180°,
16a are about SAG inch while the outer îñexible rim sec 50 and sheeting of air-permeable material held between said
tion 1Gb is about 5,4m inch wide and about 1&4 inch thick.
The ribs 12 at their outer surfaces are about 2%@ inches
rib sections, the outer peripheral edge of said sheeting
being 4fixed to said rim, and said sheeting having a pair
`of inner peripheral edge portions, each of said inner pe
ripheral edge portions overlying a different one of the
about 5,52 inch.
.
.
55 outwardly sloping walls and being fixed thereto.
Filters formed of polyethylene possess desirable physi
`6. lAu article as, set forth in claim 5 in which said
Vcal properties in that all parts, including the hub, ribs
sheeting comprises a plurality of layers of air-permeable
and both rim sections, are formed of comparatively soft
material, the outer layers having inner portions removed
and yielding material which makes it easy to bend and
from the peripheral edge portions, and each of the inner
reshape the filter elements. Further, the filters of the 60 peripheral edge portions being formed by a different one
invention formed of polyethylene are relatively strong
of the inner portions of the outer layers.
and rugged and separation of the porous sheet 17 in
7. An article of the class described comprising a body
long and their maximum width, lat the inner surfaces
which are in physical contact with the porous sheets, is
FIGS. 1 to 4 and separation of sheets 17a and 17b in
of air-impermeable material including rib structure and a
FIG. 5 from the hub, rib and rim parts formed of poly
Vrim at its periphery which is iixed thereto, said rib struc
ethylene does not occur with ordinary handling of the 65 ture including ribs split in a lengthwise direction to pro
filter units and their use as so-called “fine filters” in house
vide rib sections with their inner surfaces back to back,
sheeting of air-permeable material held between said rib
hold appliances. .
Although I have illustrated and described particular
sections, the inner surface of the rim having a Wall which
slopes outward from one side of a plane passing through
embodiments of my invention, ‘I desire not to be limited
to the particular arrangements., set forth, and I intend 70 said sheeting at the vicinity of said rim, said wall sloping
in the following claims to cover all modifications which
at an acute angle to said plane and in a direction toward
the outer periphery of said rim, said sheeting having
do not depart from the spirit and scope of the invention.
an outer peripheral edge portion which overlies said slop
I claim:
ing wall and is iixed thereto.
l. An article of the class described comprising a body
S. An article of the class described comprising a body
of air-impermeable material including rib structure and a 75
3,082,587
5
of air-permeable material including rib structure and a
rim at its periphery which is fixed thereto, said rib struc
ture including ribs split in a lengthwise direction to pro
vide rib sections with their inner surfaces back to back
an acute angle to said plane and in a direction from said
rim, and said sheeting having an inner peripheral edge
portion which overlies said last-mentioned sloping wall
portieri and is fixed thereto.
and a part removed from said rim to which a plurality of
said ribs are fixed, sheeting of air-permeable material held
between said rib sections, the outer peripheral edge of
said sheeting being iixed to said rim, the outer surface of
said part having a wall which slopes outward from a plane
passing through said sheeting7 at the vicinity of said part, 10
said wall sloping at an acute angle to said plane and in a
direction from the rim, and said sheeting having an inner
peripheral edge portion which overlies said sloping wall
and is iixed thereto.
9. An article as set forth in claim 7 in which said rib 15
structure includes a part removed from said rim to which
a plurality of said ribs are iixed, the louter surface of said
part having a wall which slopes outward from the one
side of said plane passing through said sheeting at the
vicinity of said part, said last-mentioned wall sloping at 20
References Cited in the file of this patent
UNITED STATES PATENTS
250,331
514,515
1,215,974
Atwood et al ___________ __ Dee. 6, 1881
2,008,067
2,252,724
2,345,265
2,784,132
Stevens ______________ __ Feb. 13,
Orem ________________ __ Feb. 13,
Faber ________________ __ Xuly 16,
Myers _______________ __ Aug. 19,
Jepson et al ___________ __ liar. 28,
Maisel _______________ __ Mar. 5,
1894
1917
1,027,343
69,001
France ______________ __ Feb. 1l, 1953
France ______________ __ Mar. 24, 1958
1935
1941
1944
1957
FOREIGN PATENTS
(Addition to No. 1,698,513)
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